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ASHRAE Standard 221-2020 -- Test Method to Field-Measure and Score the Cooling and Heating Performance of an Installed Unitary HVAC System (ANSI Approved), 2020
- ANSI/ASHRAE Standard 221-2020 [Go to Page]
- CONTENTS
- FOREWORD
- 1. PURPOSE
- 2. SCOPE
- 3. DEFINITIONS AND ACRONYMS [Go to Page]
- 3.1 Definitions
- 3.2 Abbreviations and Acronyms
- 4. CLASSIFICATIONS [Go to Page]
- 4.1 Heating System Performance Ratio (HSP-r). This test and calculation method produces an installed system heating capacity score based on the ratio of the sensible heating capacity delivered through the supply registers and return grilles divided i...
- 4.2 Cooling System Performance Ratio (CSP-r). This test and calculation method produces an installed system cooling capacity score based on the ratio of the total cooling capacity delivered through the supply registers and return grilles divided into...
- 4.3 Installed Cooling System EER (ICS-eer) (I-P) Installed Cooling System COP (ICS- cop) (SI). This test and calculation method produces an installed system cooling efficiency score based on the ratio of the total cooling capacity delivered through t...
- 5. INSTALLED SYSTEM PERFORMANCE BASIC TEST AND CALCULATION PROCEDURES [Go to Page]
- 5.1 Heating System Performance Ratio (HSP-r) Test Procedure. This section describes the test and calculation procedure required to field measure and score the performance of an installed heating system at elevations < 1000 ft (300 m) having no outdoo...
- 5.2 Cooling System Performance Ratio (CSP-r) Test Procedure. This section describes the test and calculation procedure required to field measure and score the performance of an installed cooling system having no outdoor air, or residential systems wi...
- 5.3 Installed Cooling System EER (ICS-eer) (Installed Cooling System COP [ICS-cop]) Test Procedure. This section describes the test and calculation procedure required to field measure and score the EER of an installed cooling system having no outdoor...
- 6. PERFORMANCE METRIC CALCULATIONS [Go to Page]
- 6.1 Calculations for Systems without Outdoor Air Ventilation
- 6.2 Calculations for Systems with Outdoor Air Ventilation
- 6.3 Variations for Different Types of Heat
- 7. DATA COLLECTION PROCEDURES [Go to Page]
- 7.1 Test Technician Qualifications. Tests shall be conducted by a qualified individual, defined as personnel who possess the following:
- 7.2 Obtain Project Plans and Equipment Specifications. This section sets forth the procedures and calculations required for compliance with this standard to complete the planning, preparation, tests, and calculations required to score the performance...
- 7.3 Gather Customer and Project Information. The name and contact information of the customer, project, and testing company shall be recorded within the system performance scoring report.
- 7.4 Prepare Design Portion of System Performance Scoring Report. Prior to field testing, the test practitioner shall prepare a copy of the system performance scoring report matching the type and mode of the system being tested. At a minimum, the foll...
- 7.5 Inspect The System Being Tested. Prior to testing the system, the test practitioner shall inspect the system and document obvious installation defects within the system performance scoring report.
- 7.6 Install Test Ports. To provide access for the test instruments and probes into the fluid flow, test ports shall be installed into the system at locations meeting the requirements of the test procedures.
- 7.7 System Start-Up Procedure. The system shall be started up in either full cooling or heating operation and shall be allowed to run until system operating requirements (Sections 5.1.1, 5.1.2) are met.
- 7.8 System Operating Requirements. System operating requirements shall be met to provide methodological consistency between tests conducted at different times on the same system.
- 7.9 Airflow Measurement Procedures. The volume of airflow shall be measured and recorded for each supply register in a system. When the system includes an economizer or outdoor air ventilation, the volume of airflow through the air-side economizer or...
- 7.10 Temperature and Enthalpy Measurement Procedures. A series of air temperature or enthalpy measurements, depending on the required measurements for the test being performed as specified in Section 6, shall be taken and recorded across the system. ...
- 7.11 System Electrical Consumption Measurement Procedures. When scoring the installed system performance in cooling mode using the ICS-eer (ICS-cop), electrical consumption measurements are required to be measured and recorded. Total system and suppl...
- 8. TEST INSTRUMENTS [Go to Page]
- 8.1 Air Balancing (capture) Hood Assembly
- 8.2 Digital Anemometer
- 8.3 Pressure Measurement—Manometers
- 8.4 Multisensor Thermometer/Psychrometer
- 8.5 Electrical Power Meter
- 9. REFERENCES
- NORMATIVE APPENDIX A: GENERIC EXPANDED EQUIPMENT PERFORMANCE TABLES [Go to Page]
- A1. GENERIC COOLING CAPACITY AND EFFICIENCY TABLES
- INFORMATIVE APPENDIX B: MEASUREMENT UNITS AND CONVERSION TABLE
- INFORMATIVE APPENDIX C: CALCULATIONS BACKGROUND [Go to Page]
- C1. Introduction
- C2. Theoretical Basis [Go to Page]
- C2.1 Assumptions and Simplifications. In field measurement applications, there are a number of challenges related to instrumentation accuracy, accessibility of measurement locations, physical configuration of systems, and technician time constraints....
- C2.2 System Delivered Capacity. An energy balance on the air side of the system can be expressed as follows:
- INFORMATIVE APPENDIX D: DATA COLLECTION FORMS
- INFORMATIVE APPENDIX E: INFORMATIVE REFERENCES [Go to Page]
